TY - JOUR
T1 - Effective temperature of red-blood-cell membrane fluctuations
AU - Ben-Isaac, Eyal
AU - Park, Yongkeun
AU - Popescu, Gabriel
AU - Brown, Frank L.H.
AU - Gov, Nir S.
AU - Shokef, Yair
PY - 2011/6/8
Y1 - 2011/6/8
N2 - Biologically driven nonequilibrium fluctuations are often characterized by their non-Gaussianity or by an "effective temperature", which is frequency dependent and higher than the ambient temperature. We address these two measures theoretically by examining a randomly kicked particle, with a variable number of kicking motors, and show how these two indicators of nonequilibrium behavior can contradict. Our results are compared with new experiments on shape fluctuations of red-blood cell membranes, and demonstrate how the physical nature of the motors in this system can be revealed using these global measures of nonequilibrium.
AB - Biologically driven nonequilibrium fluctuations are often characterized by their non-Gaussianity or by an "effective temperature", which is frequency dependent and higher than the ambient temperature. We address these two measures theoretically by examining a randomly kicked particle, with a variable number of kicking motors, and show how these two indicators of nonequilibrium behavior can contradict. Our results are compared with new experiments on shape fluctuations of red-blood cell membranes, and demonstrate how the physical nature of the motors in this system can be revealed using these global measures of nonequilibrium.
UR - http://www.scopus.com/inward/record.url?scp=79960631220&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.106.238103
DO - 10.1103/PhysRevLett.106.238103
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AN - SCOPUS:79960631220
SN - 0031-9007
VL - 106
JO - Physical Review Letters
JF - Physical Review Letters
IS - 23
M1 - 238103
ER -